US8351150B2 - Isolating unstable air pressure in a hard disk drive (HDD) - Google Patents
Isolating unstable air pressure in a hard disk drive (HDD) Download PDFInfo
- Publication number
- US8351150B2 US8351150B2 US12/629,573 US62957309A US8351150B2 US 8351150 B2 US8351150 B2 US 8351150B2 US 62957309 A US62957309 A US 62957309A US 8351150 B2 US8351150 B2 US 8351150B2
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- disk
- reservoir
- base plate
- air pressure
- drive
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- 238000000034 method Methods 0.000 claims description 16
- 238000011144 upstream manufacturing Methods 0.000 claims description 9
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 230000002401 inhibitory effect Effects 0.000 claims 1
- 239000000725 suspension Substances 0.000 description 5
- 230000000712 assembly Effects 0.000 description 3
- 238000000429 assembly Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000002939 deleterious effect Effects 0.000 description 2
- 238000013500 data storage Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B25/00—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus
- G11B25/04—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using flat record carriers, e.g. disc, card
- G11B25/043—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using flat record carriers, e.g. disc, card using rotating discs
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
- G11B33/14—Reducing influence of physical parameters, e.g. temperature change, moisture, dust
- G11B33/148—Reducing friction, adhesion, drag
Definitions
- Embodiments of the present technology relates generally to the field of hard disk drives.
- HDD hard disk drive
- Unstable air flow can enter the cavity and subsequently migrate to the region of the disks.
- the unstable air flow migrates through a passage way between the cavity and the disk region and causes disk vibrations.
- unstable air pressure can be constantly collected and pumped into the cavity which causes a decrease in bypass efficiency.
- FIG. 1 illustrates an example of a HDD, in accordance with an embodiment of the present invention.
- FIG. 2 illustrates an example of a cover of a HDD, in accordance with an embodiment of the present invention.
- FIG. 3 illustrates an example of a cross-section of a HDD, in accordance with an embodiment of the present invention.
- FIG. 4 illustrates an example of a flow chart of a method for isolating unstable air pressure in a HDD, in accordance with an embodiment of the present invention.
- the rotation of disks in an HDD causes airflow within the HDD.
- the turbulence in the airflow can cause the disks to vibrate and negatively affect HDD performance. It is thus desirable to extract flow momentum and energy from the disk pack in order to reduce the flow induced vibration.
- One such system is known in the prior art as bypass architecture, whereby the airflow is directed away from the disks and circulated around the actuator mechanism before finally returned back to the disks.
- bypass architecture whereby the airflow is directed away from the disks and circulated around the actuator mechanism before finally returned back to the disks.
- FIG. 1 a schematic drawing of one embodiment of an information storage system 100 comprising a magnetic hard disk drive (HDD) 111 for a computer system is shown.
- Drive 111 has an outer housing or base 113 containing a disk pack having at least one media or magnetic disk 115 .
- the disk or disks 115 are rotated (see arrows 141 ) by a spindle motor assembly having a central drive hub 117 .
- An actuator 121 comprises a plurality of parallel actuator arms 125 (one shown) in the form of a comb that is movably or pivotally mounted to base 113 about a pivot assembly 123 .
- a controller 119 is also mounted to base 113 for selectively moving the comb of arms 125 relative to disk 115 .
- each arm 125 has extending from it at least one cantilevered load beam and suspension 127 .
- a magnetic read/write transducer or head is mounted on a slider 129 and secured to a flexure that is flexibly mounted to each suspension 127 .
- the read/write heads magnetically read data from and/or magnetically write data to disk 115 .
- the level of integration called the head gimbal assembly (HGA) is the head and the slider 129 , which are mounted on suspension 127 .
- the slider 129 is usually bonded to the end of suspension 127 .
- Suspensions 127 have a spring-like quality, which biases or urges the air bearing surface of the slider 129 against the disk 115 to cause the slider 129 to fly at a precise distance from the disk.
- a voice coil 133 free to move within a conventional voice coil motor magnet assembly 134 is also mounted to arms 125 opposite the head gimbal assemblies. Movement of the actuator 121 (indicated by arrow 135 ) by controller 119 moves the head gimbal assemblies along radial arcs across tracks on the disk 115 until the heads settle on their respective target tracks.
- the head gimbal assemblies operate in a conventional manner and always move in unison with one another, unless drive 111 uses multiple independent actuators (not shown) wherein the arms can move independently of one another.
- the disk pack and disks 115 (one shown) define an axis 140 of rotation 141 and radial directions 142 , 143 , relative to the axis 140 .
- the drive 111 also has a bypass channel 150 formed in the housing 113 for directing the airflow 160 generated by rotation of the disks 115 from the upstream side of the disk pack or disks (e.g., proximate to radial direction 142 in FIG. 1 ) 115 to the downstream side of the disk pack or disks 115 (e.g., proximate to radial direction 143 in FIG. 1 ).
- the bypass channel 150 is located between an outer perimeter 116 ( FIG.
- bypass channel 150 further comprises a first opening 151 proximate to upstream side wherein air is conveyed away from the disks 115 and a second opening 152 proximate to downstream side wherein airflow 160 is directed toward the disks 115 .
- bypass channel 150 exhibits low flow resistance to airflow 160 .
- bypass channel 150 has several advantages, including the ability to reduce aerodynamic buffeting of actuator 121 during the servo writing process and/or during normal operation of disk drive system 111 . More specifically, bypass channel 150 reduces the pressure build-up on the upstream side of actuator 121 which occurs when drive 111 is operated. Additionally, directing airflow 160 around the actuator 121 decreases the upstream pressure on the actuator, thus reducing force acting on the actuator 121 while reducing the energy of the bluff-body wake of the actuator arm.
- the airflow 160 exiting bypass channel 150 can enter into a reservoir 170 and cause an unstable air pressure (e.g., turbulence) in the reservoir.
- the bypass channel 150 is sealed with the cover 210 by external seal gasket 220 and channel gasket 240 .
- Reservoir 170 is bounded at least by base 113 , cover 210 , disk shroud 180 and external seal gasket 220 .
- the airflow 160 entering reservoir 170 causes unstable air pressure to constantly be collected and pumped into reservoir 170 .
- the unstable air pressure will tend to move towards a region of lower air pressure. If the region of the disk 115 has a lower air pressure than the unstable air pressure in the reservoir 170 , then the unstable air in the reservoir will flow from the reservoir to the region of the disk 115 , causing deleterious effects on the system. Examples of the deleterious effects can be but are not limited to increased forces on the actuator 121 and/or disk 115 , flow instabilities causing vibration (e.g., disk flutter) and decreased bypass efficiency. It should be appreciated that the unstable air in the reservoir 170 will travel towards the disk 115 only if there is a passage way that sufficiently allows for the passage of air from the reservoir towards the disk 115 .
- base plate 113 is raised towards the cover or top plate 210 , locally at the reservoir 170 , to isolate the unstable air pressure in the reservoir 170 from the disk 115 . Accordingly, the clearance between the base plate 113 and cover 210 is minimized such that unstable air pressure in the reservoir is inhibited to flow from the reservoir 170 directly to disk 115 .
- the clearance between the base plate 113 and the cover 210 can be less than or equal to 0.5 millimeters (mm). It should also be appreciated that the minimized clearance between base plate 113 and cover 210 prevents pressure build up in reservoir 170 , which in turn helps bypass efficiency.
- cover 210 is lowered towards base plate 113 , locally at the reservoir 170 , to isolate the unstable air pressure in the reservoir 170 from the disk 115 . Accordingly, the clearance between the base plate 113 and cover 210 is minimized such that unstable air pressure in the reservoir is inhibited to flow from the reservoir 170 directly to disk 115 .
- the clearance between the base plate 113 and the cover 210 can be less than or equal to 0.5 millimeters (mm). It should also be appreciated that the minimized clearance between base plate 113 and 210 prevents pressure build up in reservoir 170 , which in turn helps bypass efficiency.
- a reservoir seal 230 is disposed between the cover 210 and the base plate 113 to isolate the unstable air pressure in the reservoir 170 from the disk 115 .
- Reservoir seal 230 is disposed along the perimeter of the disk shroud 180 and also proximate along a periphery of disk 115 .
- Reservoir seal 230 provides for a complete seal such that unstable air pressure in the reservoir is inhibited to flow from reservoir 170 directly to disk 115 .
- reservoir seal 230 is a form-in-place gasket (FIPG). It should be appreciated that any combination of (1) raising the base plate 113 , (2) lowering the cover 210 and/or (3) disposing a reservoir seal 230 , as described above, is utilized to isolate the disk 115 from the reservoir 170 .
- FIPG form-in-place gasket
- HDD 111 does not include a bypass channel 150 and corresponding channel gasket 240 .
- Conventional HDD design without a bypass channel 150 also allows unstable air originating from the down downstream side of the rotating disk 115 to enter into reservoir 170 , as described above. Accordingly, any combination of (1) raising the base plate 113 , (2) lowering the cover 210 and/or (3) disposing a reservoir seal 230 , as described above, is utilized to isolate the disk 115 from the reservoir 170 .
- reservoir seal 230 extends along portion 235 and abuts or is integral with external seal gasket 220 .
- FIG. 4 depicts a method 400 for isolating unstable air pressure in a hard disk drive, in accordance with an embodiment of the present invention.
- method 400 is carried out by processors and electrical components under the control of computer readable and computer executable instructions.
- the computer readable and computer executable instructions reside, for example, in a data storage medium such as computer usable volatile and non-volatile memory. However, the computer readable and computer executable instructions may reside in any type of computer readable storage medium.
- method 400 is performed at least by the system of FIGS. 1-3 .
- a reservoir seal is disposed along a periphery of a disk shroud and proximate to the periphery of said at least one disk.
- the base plate is raised in the direction of said top cover, locally at the reservoir.
- the top cover is lowered in the direction of the base plate, locally at said reservoir.
- the unstable air pressure in the reservoir is isolated from the at least one disk based at least on the reservoir seal. It should be appreciated that any combination of (1) raising the base plate, at step 420 , (2) lowering the cover, at step 430 and/or (3) disposing a reservoir seat, at step 410 , as described above, is utilized to isolate the disk from the reservoir.
Abstract
Description
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US12/629,573 US8351150B2 (en) | 2009-12-02 | 2009-12-02 | Isolating unstable air pressure in a hard disk drive (HDD) |
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US12/629,573 US8351150B2 (en) | 2009-12-02 | 2009-12-02 | Isolating unstable air pressure in a hard disk drive (HDD) |
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US20110128650A1 US20110128650A1 (en) | 2011-06-02 |
US8351150B2 true US8351150B2 (en) | 2013-01-08 |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11348619B2 (en) * | 2020-07-16 | 2022-05-31 | Western Digital Technologies, Inc. | Dual gasket for manufacturing of hermetically-sealed hard disk drive |
Citations (28)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4214286A (en) | 1976-08-04 | 1980-07-22 | Burroughs Corporation | Flexible disk pack and improved transducing-manipulation thereof |
US5021905A (en) | 1989-11-13 | 1991-06-04 | Hewlett-Packard Company | Disk drive enclosure for minimizing stresses and a vibration damping seal therefor |
US5404636A (en) | 1993-11-12 | 1995-04-11 | Conner Peripherals, Inc. | Method of assembling a disk drive actuator |
US5541791A (en) * | 1994-11-17 | 1996-07-30 | Quantum Corporation | Air guide for an aerodynamic actuator latch within a disk drive |
US5546250A (en) | 1993-06-24 | 1996-08-13 | Maxtor Corporation | Elastomer gasket that extends around the outer edge of a hard drive |
US5568341A (en) * | 1994-01-20 | 1996-10-22 | Fujitsu Limited | Magnetic disk drive sealing structure having a soft elastic member bonded to a core member |
US5631787A (en) | 1994-06-27 | 1997-05-20 | Quantum Corporation | Power reduction shroud for a hard disk drive |
US6052255A (en) * | 1994-10-06 | 2000-04-18 | Hitachi, Ltd. | Magnetic disk unit having anti-impact arrangement |
US6175469B1 (en) * | 1998-12-04 | 2001-01-16 | Seagate Technology, Inc. | Disc drive magnet housing electro mechanical resonance dampening system |
US20010030830A1 (en) * | 2000-03-17 | 2001-10-18 | Fujitsu Limited | Disk drive unit |
US20020030923A1 (en) * | 2000-09-04 | 2002-03-14 | Fujitsu Limited | Sealed structure for an electronic device |
US20020039251A1 (en) * | 2000-09-29 | 2002-04-04 | Satomitsu Imai | Magnetic disk device |
US6369978B1 (en) * | 1998-07-17 | 2002-04-09 | Hitachi, Ltd. | Magnetic disk apparatus with shroud having opening downstream of moveable arm |
US20020044376A1 (en) * | 2000-10-13 | 2002-04-18 | International Business Machines Corporation | Disk drive apparatus, hard disk drive, gasket, and top cover |
US20020093757A1 (en) * | 2001-01-17 | 2002-07-18 | Seagate Technology Llc | Form-in-place gasket height variability control for a disc drive |
US20020135932A1 (en) * | 2001-03-21 | 2002-09-26 | Seagate Technology Llc | Tubular gasket for a disc drive |
US6487038B1 (en) * | 1999-06-08 | 2002-11-26 | Fujitsu Limited | Recording disk drive and method of assembling the same |
US20020181149A1 (en) * | 1998-07-17 | 2002-12-05 | Hayato Shimizu | Magnetic disk apparatus |
US20030197974A1 (en) * | 2002-04-19 | 2003-10-23 | Seagate Technology Llc | Flow divider upstream of disc drive recirculation filter |
US20040070867A1 (en) * | 2002-10-11 | 2004-04-15 | Sony Corporation | Cushioning material and information storage device using the same |
US20050041329A1 (en) * | 2003-08-20 | 2005-02-24 | Hitachi Global Storage Technologies Netherlands B.V. | Hard disk drive with aerodynamic diffuser, contraction, and fairing for disk base and re-acceleration drag reduction |
US6961211B2 (en) | 2002-04-24 | 2005-11-01 | Kabushiki Kaisha Toshiba | Disk drive apparatus having an annular straightening portion |
US20070188914A1 (en) * | 2006-02-14 | 2007-08-16 | Seagate Technology Llc | Multi-purpose flow control device |
US7301725B2 (en) | 2003-08-21 | 2007-11-27 | Samsung Electronics Co., Ltd. | Disk drive with cover plate having high stiffness |
US20080316640A1 (en) * | 2007-06-20 | 2008-12-25 | Chan Andre S | System, method, and apparatus for controlling and sealing airflow around disk drive bypass walls |
US20090002882A1 (en) * | 2007-06-29 | 2009-01-01 | Kabushiki Kaisha Toshiba | Disk drive unit |
US7474500B2 (en) | 2003-11-05 | 2009-01-06 | Samsung Electronics Co., Ltd. | Hard disk having air guide |
US7522375B2 (en) * | 2005-01-07 | 2009-04-21 | Hitachi Global Storage Technologies Netherlands B.V. | Magnetic disk drive with cover seal and method for fabricating same |
-
2009
- 2009-12-02 US US12/629,573 patent/US8351150B2/en active Active
Patent Citations (30)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4214286A (en) | 1976-08-04 | 1980-07-22 | Burroughs Corporation | Flexible disk pack and improved transducing-manipulation thereof |
US5021905A (en) | 1989-11-13 | 1991-06-04 | Hewlett-Packard Company | Disk drive enclosure for minimizing stresses and a vibration damping seal therefor |
US5546250A (en) | 1993-06-24 | 1996-08-13 | Maxtor Corporation | Elastomer gasket that extends around the outer edge of a hard drive |
US5404636A (en) | 1993-11-12 | 1995-04-11 | Conner Peripherals, Inc. | Method of assembling a disk drive actuator |
US5568341A (en) * | 1994-01-20 | 1996-10-22 | Fujitsu Limited | Magnetic disk drive sealing structure having a soft elastic member bonded to a core member |
US5631787A (en) | 1994-06-27 | 1997-05-20 | Quantum Corporation | Power reduction shroud for a hard disk drive |
US6052255A (en) * | 1994-10-06 | 2000-04-18 | Hitachi, Ltd. | Magnetic disk unit having anti-impact arrangement |
US5541791A (en) * | 1994-11-17 | 1996-07-30 | Quantum Corporation | Air guide for an aerodynamic actuator latch within a disk drive |
US6369978B1 (en) * | 1998-07-17 | 2002-04-09 | Hitachi, Ltd. | Magnetic disk apparatus with shroud having opening downstream of moveable arm |
US20020181149A1 (en) * | 1998-07-17 | 2002-12-05 | Hayato Shimizu | Magnetic disk apparatus |
US6175469B1 (en) * | 1998-12-04 | 2001-01-16 | Seagate Technology, Inc. | Disc drive magnet housing electro mechanical resonance dampening system |
US6487038B1 (en) * | 1999-06-08 | 2002-11-26 | Fujitsu Limited | Recording disk drive and method of assembling the same |
US20010030830A1 (en) * | 2000-03-17 | 2001-10-18 | Fujitsu Limited | Disk drive unit |
US20020030923A1 (en) * | 2000-09-04 | 2002-03-14 | Fujitsu Limited | Sealed structure for an electronic device |
US6631049B2 (en) * | 2000-09-04 | 2003-10-07 | Fujitsu Limited | Sealed structure for an electronic device |
US20020039251A1 (en) * | 2000-09-29 | 2002-04-04 | Satomitsu Imai | Magnetic disk device |
US20020044376A1 (en) * | 2000-10-13 | 2002-04-18 | International Business Machines Corporation | Disk drive apparatus, hard disk drive, gasket, and top cover |
US6657812B2 (en) * | 2000-10-13 | 2003-12-02 | Hitachi Global Storage Technologies Netherlands B.V. | Disk drive including a dust catching chamber and an associated gasket portion |
US20020093757A1 (en) * | 2001-01-17 | 2002-07-18 | Seagate Technology Llc | Form-in-place gasket height variability control for a disc drive |
US20020135932A1 (en) * | 2001-03-21 | 2002-09-26 | Seagate Technology Llc | Tubular gasket for a disc drive |
US20030197974A1 (en) * | 2002-04-19 | 2003-10-23 | Seagate Technology Llc | Flow divider upstream of disc drive recirculation filter |
US6961211B2 (en) | 2002-04-24 | 2005-11-01 | Kabushiki Kaisha Toshiba | Disk drive apparatus having an annular straightening portion |
US20040070867A1 (en) * | 2002-10-11 | 2004-04-15 | Sony Corporation | Cushioning material and information storage device using the same |
US20050041329A1 (en) * | 2003-08-20 | 2005-02-24 | Hitachi Global Storage Technologies Netherlands B.V. | Hard disk drive with aerodynamic diffuser, contraction, and fairing for disk base and re-acceleration drag reduction |
US7301725B2 (en) | 2003-08-21 | 2007-11-27 | Samsung Electronics Co., Ltd. | Disk drive with cover plate having high stiffness |
US7474500B2 (en) | 2003-11-05 | 2009-01-06 | Samsung Electronics Co., Ltd. | Hard disk having air guide |
US7522375B2 (en) * | 2005-01-07 | 2009-04-21 | Hitachi Global Storage Technologies Netherlands B.V. | Magnetic disk drive with cover seal and method for fabricating same |
US20070188914A1 (en) * | 2006-02-14 | 2007-08-16 | Seagate Technology Llc | Multi-purpose flow control device |
US20080316640A1 (en) * | 2007-06-20 | 2008-12-25 | Chan Andre S | System, method, and apparatus for controlling and sealing airflow around disk drive bypass walls |
US20090002882A1 (en) * | 2007-06-29 | 2009-01-01 | Kabushiki Kaisha Toshiba | Disk drive unit |
Non-Patent Citations (1)
Title |
---|
Heo, et al., "Reducing Disk Flutter by Improving Aerodynamic Design of Base Castings", IEEE,(2000),1-1. |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11348619B2 (en) * | 2020-07-16 | 2022-05-31 | Western Digital Technologies, Inc. | Dual gasket for manufacturing of hermetically-sealed hard disk drive |
US11842754B2 (en) | 2020-07-16 | 2023-12-12 | Western Digital Technologies, Inc. | Dual gasket for manufacturing of hermetically-sealed hard disk drive |
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